The AD7621ACPZ is a 16-bit, 3MSPS charge redistribution SAR fully differential Analog-to-digital Converter (ADC) that operates from a single 2.5V power supply. It contains a high speed 16-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits and both serial and parallel system interface ports. It features two very high sampling rate modes, a fast mode for asynchronous rate applications and a reduced power mode for low power applications where the power is scaled with the throughput.